三峡水库运行对荆江三口水文情势变异程度分析

摘要

According to the storage operation time of Three Gorges Reservoir,the RVA method and the total degree of change are used to evaluate the variation degree of hydrological regime of three outlets in Jingjiang River.The results show that the operation of Three Gorges Reservoir has certain impacts on Jingjiang three hydrological regimes,and its hydrological comprehensive change degree is 62.07％.It is shown that the impacts include monthly average flow rate in January to May,July,August and October,annual average minimum flow rate of 1,3,7,30 and 90 d,and the valley bottom number and duration time of low flow.The operation of Three Gorges Reservoir has an obvious flood peak reducing effect on Jingjiang three outlets.%根据三峡水库蓄水运行时间,运用变化范围法(RVA)和整体改变度对荆江三口水文情势变异程度进行评价.结果表明,三峡水库运行对荆江三口流域水文情势产生一定影响,其水文综合改变度为62.07％,属于中度改变,主要影响表现在1月～5月、7月、8月、10月月均流量、年均1、3、7、30、90 d最小流量、低流量的谷底数、低流量平均持续时间等方面.三峡水库运行对荆江三口河流的削峰填谷作用明显.